// ******************************************************************
// Copyright � 2015-2018 nventive inc. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// ******************************************************************
using System;
using System.Collections.Generic;

namespace Uno.Extensions
{
    public static class StackExtensions
    {
        public static T PeekOrDefault<T>(this Stack<T> stack)
        {
            return stack.Empty() ? default(T) : stack.Peek();
        }

        public static IDisposable Subscribe<T>(this Stack<T> stack, T value)
        {
            stack.Push(value);

            return Actions.Create(() => stack.Pop()).ToDisposable();
        }
    }
}